Parametric numerical study of electrokinetic instability in cross-shaped microchannels

Qian Li; Yann Delorme; Steven H. Frankel

doi:10.1007/s10404-015-1666-1

Parametric numerical study of electrokinetic instability in cross-shaped microchannels

Qian Li, Yann Delorme, Steven H. Frankel

Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

A multiblock in-house solver based on high-order accurate finite-difference schemes is developed to simulate electrokinetic instability (EKI) phenomena in realistic cross-shaped microchannels. Parametric numerical studies are systematically carried out to investigate the effects of different parameters on EKI including the conductivity ratio, the electric field strength, the channel depth, and the electric field ratios. Simulation results show that the solver has the capability to capture the threshold electric field for the onset of instabilities and it offers a good prediction for the critical features of EKI compared to the experiments presented in the literature. In addition, from the general parametric studies several useful guidelines are explored. Such guidelines can be applied to enhance the mixing efficiency in electrokinetic microdevices.

Original language	English
Article number	29
Pages (from-to)	1-12
Number of pages	12
Journal	Microfluidics and Nanofluidics
Volume	20
Issue number	2
DOIs	https://doi.org/10.1007/s10404-015-1666-1
State	Published - 1 Feb 2016

Keywords

Electrokinetic instability
High-order finite difference
Microfluidics
WENO scheme

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Materials Chemistry

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10.1007/s10404-015-1666-1

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abstract = "A multiblock in-house solver based on high-order accurate finite-difference schemes is developed to simulate electrokinetic instability (EKI) phenomena in realistic cross-shaped microchannels. Parametric numerical studies are systematically carried out to investigate the effects of different parameters on EKI including the conductivity ratio, the electric field strength, the channel depth, and the electric field ratios. Simulation results show that the solver has the capability to capture the threshold electric field for the onset of instabilities and it offers a good prediction for the critical features of EKI compared to the experiments presented in the literature. In addition, from the general parametric studies several useful guidelines are explored. Such guidelines can be applied to enhance the mixing efficiency in electrokinetic microdevices.",

keywords = "Electrokinetic instability, High-order finite difference, Microfluidics, WENO scheme",

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N2 - A multiblock in-house solver based on high-order accurate finite-difference schemes is developed to simulate electrokinetic instability (EKI) phenomena in realistic cross-shaped microchannels. Parametric numerical studies are systematically carried out to investigate the effects of different parameters on EKI including the conductivity ratio, the electric field strength, the channel depth, and the electric field ratios. Simulation results show that the solver has the capability to capture the threshold electric field for the onset of instabilities and it offers a good prediction for the critical features of EKI compared to the experiments presented in the literature. In addition, from the general parametric studies several useful guidelines are explored. Such guidelines can be applied to enhance the mixing efficiency in electrokinetic microdevices.

AB - A multiblock in-house solver based on high-order accurate finite-difference schemes is developed to simulate electrokinetic instability (EKI) phenomena in realistic cross-shaped microchannels. Parametric numerical studies are systematically carried out to investigate the effects of different parameters on EKI including the conductivity ratio, the electric field strength, the channel depth, and the electric field ratios. Simulation results show that the solver has the capability to capture the threshold electric field for the onset of instabilities and it offers a good prediction for the critical features of EKI compared to the experiments presented in the literature. In addition, from the general parametric studies several useful guidelines are explored. Such guidelines can be applied to enhance the mixing efficiency in electrokinetic microdevices.

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Parametric numerical study of electrokinetic instability in cross-shaped microchannels

Abstract

Keywords

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